🚀 go-pugleaf

In article <1ihdmfINNnnt@sauna.cs.hut.fi>, s34090e@kaira.hut.fi (Petri Taavila) writes:
|> What is the "best" way to pass information from modal
|> dialogbox to its parent window if there are many
|> different controls in the dialogbox?

1. If the parent window only needs to know which button (e.g. OK or Cancel)
   was pressed then you can do this with the return value from the call
   to DialogBox() -- this return value is the second parameter supplied to
   the EndDialog() call.

   The assumption here is that the other controls in the dialog box are
   used to adjust global variables that both the dialog box procedure and
   the parent window code have access to.

2. You can pass a pointer to a block of memory as the last parameter in
   the call to DialogBoxParam().  The dialog box procedure should store this
   in a static variable during WM_INITDIALOG processing so that it can
   access it during subsequent messages.

   This block of memory then contains the flags and other assorted data
   that map onto the dialog box controls.  The dialog box adjusts the data
   as necessary and when control is returned to the parent window it can
   read the data to see what happened.

I find myself doing it either way -- it depends on how much you dislike
using global variables.  If I stretch my imagination I'm sure that I could
come up with some more esoteric ways of doing this, but these two are going
to be the most common.


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Tom Brown               |  "She turned me into a newt...
PE Nelson Systems       |                                  ... I got better"
twbrown@pe-nelson.com   |                    Monty Python and the Holy Grail
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